Compound bow structure

ABSTRACT

A compound bow structure includes a riser having a grip and a recess is defined in the inside of the grip. A first cam and a second cam are respectively connected to the two limbs and a string is connected between the first and second cams. Two cables each have a first end connected to the first/second cam corresponding thereto. The two cables each have a second end which has two split sub-cables. The sub-cables of the two cables are respectively connected to two sides of the first/second cam corresponding thereto. A protector is connected to the inside of the grip and located to cover the recess of the grip. A gap is formed between the grip and the protector to accommodate the user&#39;s hand. The distance between the lowest point of the recess and the string is smaller than ⅕ of the length of the string.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a compound bow, and more particularly to a compound bow with a protector to protect the user's hand from being injured by the string.

2. Description of Related Art

A conventional bow generally includes a bow and a string is connected between the two limbs of the bow. The string can be pulled away from the bow to store energy. An arrow is attached with the string by its nock so that when the string is released, the arrow is delivered to the target by the energy.

Another conventional bow known to applicant comprises a grip with two limbs connected thereto, a string is connected between the two limbs. The bow has a rom and a passage which communicates with the room. A buffering member is located in the room. An arrow has a shank with a tip and a nock formed on two ends thereof, the shaft extends through the passage and the nock is connected with the string, while the tip is located in the room. When releasing the string, the tip is movable in the room and the buffering member absorbs the energy of the tip in the room so that the bow can be used in a small area and the buffering member protect the users from being injured during the action.

However, the conventional bows mentioned above are too light to be used for sport purpose because the light bows lack stability. FIG. 6 shows a compound bow which has a riser 7 with two limbs 8 connected to two ends of the riser 7. Each limb 8 is cooperated with a cam 9. A string 71 is connected between the two cams 9. However, the limbs 8 are heavy and the user cannot hold the riser 7 for a longer period of time. If the user's hand shakes, he/she cannot hit the target. If length of the limbs 8 is reduced, the riser 7 will be too close to the string 71, and the string 71 may injure the user's hand holding the riser 7 after shooting.

The present invention provides a compound bow structure with a protector so as to mitigate and/or obviate the disadvantages of the conventional bows.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a compound bow structure which has a protector located between the grip and the string so as to protect the user's hand from being hit by the string after the string is released.

The present invention provides a compound bow structure and comprises a riser having a grip, and two extensions extend from two ends of the grip. A recess is defined in the inside of the grip. Two limbs are respectively connected to two distal ends of the two extensions. A protector is connected to the inside of the grip and located between the two limbs. The protector is located to cover the recess of the grip. A control unit has a first cam and a second cam respectively connected to two respective distal ends of the two limbs. A string is connected between the first and second cams. Two cables each have a first end connected to the first/second cam corresponding thereto. The two cables each have a second end which has two split sub-cables. The sub-cables of the two cables are respectively, connected to two sides of the first/second cam corresponding thereto. The distance between the lowest point of the recess and the string is smaller than ⅕ of the length of the string.

Preferably, the protector is an elongate plate which has two ends, and the two ends of the protector are connected to two ends of the recess. A gap is formed between the grip and the protector so as to accommodate the user's hand.

Preferably, each of the two limbs has a notch to form a first arm and a second arm. The first and second cams are respectively located in the two notches of the two limbs. The axle of each of the first and second cams is connected between the first and second arms corresponding thereto.

Preferably, the sub-cables of the cables are respectively connected to two ends of the axle of the first/second cam corresponding thereto to adjust the tension of the string and to adjust the distance between the string and the riser.

Preferably, the coefficient of elasticity of each of the two limbs is larger than that of the riser.

Preferably, the distance between the lowest point of the recess and the string is equal to ⅙ of the length of the string.

Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the compound bow structure of the present invention;

FIG. 2 is an exploded view to show the limbs with the string and the riser of the compound bow structure of the present invention;

FIG. 3 is an exploded view to show the protector and the riser of the compound bow structure of the present invention;

FIG. 4 is side view to show the compound bow structure of the present invention, wherein the string is not yet pulled;

FIG. 5 is side view to show the compound bow structure of the present invention, wherein the string is pulled, and

FIG. 6 shows the conventional compound bow structure.

DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings and initially to FIGS. 1 to 3, the compound bow structure in accordance with the present invention comprises a riser 1 having a grip 11, and two extensions 12 extend from two ends of the grip 11. The riser 1 has an inside 13 and an outside 14. A recess 131 is defined in the inside of the grip 11. Two limbs 2 respectively connected to the two distal ends of the two extensions 12. Each of the two limbs 2 has a notch 21 to form a first arm 22 and a second arm 23. A protector 3 is connected to the inside of the grip 11 and located between the two limbs 2. The protector 2 is an elongate plate which has two ends. The two ends of the protector 3 are connected to two ends of the recess 131 to cover the recess 131. A gap 5 is formed between the grip 11 and the protector 3 so as to accommodate the user's hand.

A control unit 4 comprises a first cam 41 and a second cam 42 respectively connected to two respective distal ends of the two limbs 2. In detail, the first and second cams 41, 42 are respectively located in the two notches 21 of the two limbs 2. Each of the first and second cams 41, 42 has an axle 6 extending therethrough. The axle 6 of each of the first and second cams 41, 42 is connected between the first and second arms 41, 42 corresponding thereto.

A string 43 is connected between the first and second cams 41, 42. Two cables 44 each have a first end connected to the first/second cam 41/42. The two cables 44 each have a second end which has two split sub-cables 441. The two sets of the sub-cables 441 of the two cables 44 are respectively connected to the two ends of the axle 6 of the first/second cam 41/42 corresponding thereto to adjust the tension of the string 43 and to adjust the distance between the string 43 and the riser 1. Further referring to FIG. 4, the distance “L” between the lowest point of the recess 131 and the string 43 is smaller than ⅕ of the length “D” of the string 43. Preferably, the coefficient of elasticity of each of the two limbs 2 is larger than that of the riser 1.

When in use, further referring to FIG. 5, the user holds the grip 11 of the riser 1 and the protector 3 covers the hand holding the grip 11. The other hand of the user pulls the string 43 away from the riser 1. The first and second cams 41, 42 are then rotated and the two limbs 2 are slightly deformed. An arrow (not shown) is attached to the string 43 by its nock. The stroke that the string 43 is pulled from its initial position to the maximum position decides the distance that the arrow can reach. The longer the stroke is pulled, the longer distance that the arrow can reach. When the string 43 is released, the string 43 bounces back, and the user's hand is protected from being hit by the string 43 by the protector 3.

The protector 3 is durable and light in weight. Preferably, the protector 3 is made by plastic or hard rubber. The protector 3 can be connected to the grip 11 by using screws, rivets or by way of snapping. The user's hand in the gap 5 is large enough to allow the user's hand to easily inserted and remove. Preferably, the distance “L” between the lowest point of the recess 131 and the string 43 is equal to ⅙ of the length “D” of the string 43.

Furthermore, the notch 21 defined in each of the two limbs 2 reduces the weight of the limb 2. The first and second cams 41, 42 are located within the two respective notches 21 to allow the shorter limbs 41, 42 to be used.

The sub-cables 441 of each of the cables 44 are respectively connected to the two ends of the axle 6 of the first/second cam 41/42 corresponding thereto to adjust the tension of the string 43 and to adjust the distance between the string 43 and the riser 1.

The coefficient of elasticity of each of the two limbs 2 is larger than that of the riser 1 so as to allow the limbs 2 to be further deformed relative to the riser 1 to obtain longer stroke.

The riser 1 and the limbs 2 can be integral to each other, or the riser 1 and the limbs 2 can be assembled to each other. The weight of the limbs 2 is controlled not to increase the whole weight of the compound bow structure of the present invention. The proper length of the limbs 2 can stabilize the compound bow structure without being affected by the return of the string 43.

Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed. 

1. A compound bow structure comprising: a riser having a grip and two extensions extending from two ends of the grip, a recess defined in an inside of the grip, two limbs respectively connected to two distal ends of the two extensions; a protector being an elongate plate which has two ends, the protector connected to the inside of the grip and the two ends of the protector connected to two ends of the recess, a gap being formed between the grip and the protector so as to cover the recess of the grip and be adapted to accommodate a user's hand, and a control unit having a first cam and a second cam respectively connected to two respective distal ends of the two limbs, a string connected between the first and second cams, two cables each having a first end connected to the first/second cam corresponding thereto, the two cables each having a second end which has two split sub-cables, the sub-cables of the two cables respectively connected to two sides of the first/second cam corresponding thereto, a distance between a lowest point of the recess and the string being smaller than ⅕ of a length of the string.
 2. (canceled)
 3. The compound bow structure as claimed in claim 1, wherein each of the two limbs has a notch to form a first arm and a second arm, the first and second cams are respectively located in the two notches of the two limbs, each of the first and second cams has an axle extending therethrough, the axle of each of the first and second cams is connected between the first and second arms corresponding thereto.
 4. The compound bow structure as claimed in claim 3, wherein the sub-cables of the cables are respectively connected to two ends of the axle of the first/second cam corresponding thereto to adjust a tension of the string and to adjust a distance between the string and the riser.
 5. The compound bow structure as claimed in claim 1, wherein a coefficient of elasticity of each of the two limbs is larger than that of the riser.
 6. The compound bow structure as claimed in claim 1, wherein the distance between the lowest point of the recess and the string is equal to ⅙ of the length of the string. 